Consolidated Balance Sheets (Parenthetical) - shares	Mar. 31, 2016	Dec. 31, 2015
Partners' capital:
Limited Partners' Capital Account, Units Outstanding	95,339,786	87,365,706
Common Units - Public [Member]
Partners' capital:
Limited Partners' Capital Account, Units Issued	49,588,960	49,588,960
Limited Partners' Capital Account, Units Outstanding	49,588,960	49,588,960
Common Units - Affiliated [Member]
Partners' capital:
Limited Partners' Capital Account, Units Issued	45,750,826	37,776,746
Limited Partners' Capital Account, Units Outstanding	45,750,826	37,776,746
Class A Units - Held by Subsidiary [Member]
Partners' capital:
Limited Partners' Capital Account, Units Issued	0	11,018,744
Limited Partners' Capital Account, Units Outstanding	0	11,018,744
Class C Units - Held by Subsidiary [Member]
Partners' capital:
Limited Partners' Capital Account, Units Issued	16,410,780	0
Limited Partners' Capital Account, Units Outstanding	16,410,780	0